Ventilating apparatus



R. E. HELLMUND.

VENTILATING APPARATUS.

APPLICATION FILED Ausrr. 1917.

Patented Aug. 2, 1921.

LLJ

INVENTOR Rudolf E Heflm/md AT TORNEY ya W 1% M.

-. UNITED STATES P AIENTY OFFICE.

RUDOLF E. HELLMUND, OF SWISSVALE, PENNSYLVANIA, ASSIGNOR '10 WESTING-nousa ELECTRIC & MANUFACTURING COMPANY,

' vnmrm'rme arramrus,

SYLVANIA.

To all whom it may concern.

Be it known that I, RUDOLF E. HELL- MUND, a citizen of the GermanEmpire, and a resident of Swissvale, in the county of. Allegheny andState of Pennsylvania, have invented a new and useful Improvement inVentilating Apparatus, of which the following-is aspecification.

y invention relates to ventilating apparatus having special relation tothe ventilation of electrical machinery and it has for air issues to aits objectto provide a simple and inexpen sive device of the characterdesignated which shall prevent snow or ice from entering the of a motorembodying machine casing.

Referring to the accompanying drawings, Figure 1 is a fragmentary sideview, partially in'elevation and partially in section, my invention.Fig. 2 is a sectional View of v caSing 'embOdying a slight modificationof m invention.

eretofore, difficulties have been encountered in ventilating machinerywhich 'is employed in outdoor service, in preventing snow or othercongealed particles from entering with the air. By my invention, I provide a device whereby air ,is enter the machine casing, but, i tainssnow or other congealed particles, the air opening will be automaticallyclosed, and the ventilation of the machine will stop entirely until themachine heats, due to lack of ventilation, and melts the congealedparticles, whereby the path for the circulation of air will be reopened.I

In Fig. 1, a motor is shown having a-rotor member 2 mounted on a shaft 3vided with a bearing member 1. A casing member 5 is adapted to-beattached to the bearing member 4 and to a main field frame 6 and isprovided with a device? for admitting air into the motor casing. Thede-' vice 7 consists of a substantially U-shaped member 8 and adownwardly extending member 9 which projects into said member 8. Air isadmitted to a relatively large opening 10 in the member 8 and passesdownwardly through a passageway 11 which is large at the top but tapersto a very narrow passa e 12 between the end' of the downward yprojecting member 9 and the concave end surface of the member '8.

After fpermitted to. the air com a portion of a motor of which is pro-.

A. CORPORATION 01 PENN- Specification of Letters Patent. Patented Aug-2, 1921- Application filed August 7,1917. Serial No. 184,798. I i

much larger passageway 13 and from there 1ng. -The veloclty of the air,in passing through the opening 10 and the top of the passageway 11, willbe relatively low, but, I

on entering'the passageway l2, the velocity will be relatively highbecause of the smaller dlmensions of the last named passageway, afterwhich the air passes into the relatively large passageway 13 at a muchlower veloclty. The air passing through the opening 10 and the top ofthe passageway 11, on account of its low velocity, would not tend topick up any particles of foreign matter, but the velocity in the.passageway 12 being relatively high, any particles offoreign mat terin'the air would be carried into-the passageway 13. On account of thelow velocity of the air in the foreign matter would not be carriedupwardly with the air, and would therefore collect in a mass at thebottom of the concave surface of the U-shaped member 8, therebypreventing the flow of all ventilating air currents into the motor. Whenthe temperature of the machine rises to such point as to melt the frozenparticles which are cbllected in the passageway 12, the water resultingtherefrom will pass out of the casing through a relatively narrowopening 14 which is located at the lowest point of the concave surfaceof the U-shaped member 8.

Referring to the modification of my invention shown in 'Fi 2, theventilatingair currents are admitte through an upwardly extending airpassage 15 from which it 'passes downwardly throu h an air passage 16into a substantially U- aped member 17. The U-shaped member 17 isadapted to col lect the congealed articles until the venti lation ceasesand the tem erature rises, as described in connection wit sulting wateris then drained off through anarrow opening 18 which is similar to thatshown at '14 in Fig. 1;

-While I have herein described in detail plicationof the same, I do notwish to be understood as limiting myself as regards the form of myinvention or its application except as imposed by the prionart and asspecifically set forth in the appended claims.

I claim as my invention:

1. An'air intake device for a ventilated passageway 13, the particlesseveral forms of my invention and one appasses inside the motor cas-Fig. 1. The re-i.

a Elia a machine comprising a casing provided with lating air currentshaving aconstricted portion adapted to be automatically closed by theaccumulation of particles of snow or ice and an outlet for the liquidresulting from the melting of said congealed particles.

3. An air intake device comprising a casing provided with a passagewayof U-shape for ventilating air currents, the bottom portion of which isrelatively narrow in order that solid particles borne by the enteringair shall be caused to accumulate and close said bottom portion.

a. An air intake device comprising a casing provided with a passagewayof substantially U-shape for ventilating air currents, the sides ofwhich expand upwardly and the bottom of which is relatively narrow toarrest congealed particles borne by the inflow ing air.

5. An air intake device consisting of a casing provided with an airpassageway comprising a downwardly extending inlet portion of relativelysmall cross-section, a lowermost portion adapted to collect particles offoreign matter, and an upwardly extending outlet passage of relativelylarge crosssection.

In testimony whereof, I subscribed my name this 30th day RUDGLF E.HELLllfUND.

have hereunto of July,

